The 17-year-old Shiffrin was third after the opening run but finished in a combined time of 1 minute, 39.85 seconds to beat Michaela Kirchgasser of Austria by 0.22 and Frida Hansdotter of Sweden by 0.26.

After the race in front of a crowd of 30,000 had ended, Shiffrin looked around in disbelief before hugging second-place Kirchgasser several times. Shiffrin's parents Jeff and Eileen embraced each other at the stands.

"I keep saying it, I keep thinking it. It doesn't make sense. It's just me," Shiffrin said when asked how it felt to be world champion.

Julia Mancuso won the United States' first medal by taking bronze in the event-opening super-G.

Shiffrin is the youngest women's world champion in any discipline since fellow American Diann Roffe-Steinrotter, who was 21 days younger when she won the giant slalom title in 1985.

Hansdotter led the race after the opening run but could not match Shiffrin's pace in the final. The Swede had finished runner-up to Shiffrin in each of the American's World Cup wins.

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